Double-plunger pump



May 18 1926. 1,585,320

I G. E. WILLERS DOUBLE PLUNGER PUMP Filed Dec. 29, 1924 2 Sheets-Sheet 1 May 18 1926. 1,585,320

G. E. WILLERS DOUBLE PLUNGER PUMP Filed D60. 29, 1924 2 Sheets-Sheet 2 3 N 1 N I ATTO/PMFKS.

Patented Riley 18, 1926.

GEORGE wineries, or rawannensuae, rnnraaa, asst-snort TO A. n'eooi'c nrc;

or rawnnnoseono, rii'nmna, a CGRL'EGPJATIO'N er -INDIANA.

DOUBLE-E1111 NGER "PUIVIP.

Application fi led December 29, 1924. Serial No. 758,544.

in withdrawing the oil from the very point where it is required to lubricate the journal within the top of'the' outer hollow rod. A

customary trouble in pumpsof. this type is a hot box inthe topof the outer rod or in the cross head thereof.

It is the object of my invention to avoid this, and I accomplish my object by that certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed.

In the drawings:

Figure 1 is a front elevation of a double plunger pump actuating element.

Figure 2 is an elevation on a larger scale of the inner and outer rods, and cross head for the outer rod, same being partly in section.

Figure 3 is a central vertical cross section of the parts shown in Figure 2.

To illustrate a pump of the type to which my invention is applied I have shown a device having a base 1 with standards 2. A pair of vertical rods 3 serves to mount the cross heads which move up and down, carrying with them the outer and inner plunger rods. lhe cross head for the inner plunger rod 4 is shown at i, and for the outer rod 5 is shown at 5. v A rocking member 6 actuates the lower cross head 5 for the outer rod, by means of connecting rods 7, 7. The upper cross head 4 is operated by connecting rods 8, 8, from a lower rocking member 9.

It will be understood that a structure such as described, makes up a double plunger operating device for pumps, and so far as my invention herein is concerned, can be of any accepted type. The two rods pass through the base of the pump into the casing, but for convenience it is the practice to form the rods where joined to the operating devices as short members and connect extensions to them.

There is shown the connector fitting or union 10, which joins inner pump rod section t to an extension at Thelit of the hollow rod 5 to the inner rod 4 cannot be made so leose'asto give much space for the union, no matter what type is used. y

. The result of this is hat the union forms a rather close'fit in theouter or hollow rod- If the space between the two rods is filled with oil, and the pump set in mot-ion, the ac: tion of this union is to lift up through the oil, and then when it moves downagain, to

push the oil ahead of it, removing it from the upper portions of the assembly, and in a short-time leaving these upper portions with.- out lubricant.

jBy special construction of-the cross heads I avoid this. 1 form the cross head 5 with the usual gland 11 for the inner rod, and leave a passage 12, through the main casting of the cross head. I then secure to the face of the cross head a hollow box-like casting 13, which has an outlet 13 registering with the passage 12. This box may have a vent for relief of pressure and for filling with oil as indicated at 14, which is above the level of the outlet 13*.

WVhen such a structure is employed the action of the union within the hollow rod is to force oil up into the chamber and draw it out again, so that the union does not force its way up through the column of oil and then pump it downwardly into the underground portions of the device, as in all previous structures with which I am familiar.

To replenish lubricant between the two rods the hollow cross head may be filled from time to time, and since the outer plunger threads direct into the passageway 12 in the main casting of the cross head, this will serve to fill up the spaces between the two rods with oil, which will remain there, in spite of the action of the close fitting union, resulting in free lubrication at all parts of the structure.

It is not necessary that the cross head he guided as I have shown, or that it be what may be strictly termed a cross head. The necessary feature is to have a chamber for oil communicating with the outer or hollow rod, somewhere near the gland and above the first union.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a double plunger pump, the combination of an outer hollow pump rod, and an 7 res F-IQEI.

inner pump rod passing down through the said outer rod, means for guiding the inner rod at the point of entrance into the outer rod, and a member for mounting the outer rod having; an oil chamber therein, with an air vent in the upper portion of said chamber, said chamber communicating With the interior of the rod, and formed so as to catch lubricant pumped upwardly through the outer rod, for the purpose described.

2. In a double plunger pump, the combination of an outer hollow pump rod, and an inner pump rod passing down through the said outer rod, means for guiding the inner rod at the point of entrance into the outer rod, and a member for mounting the outer rod having an oil chamber therein with an air vent in the upper portion of said chamber, said chamber communicating with the interior of the rod, and formed so as to catch lubricant pumped upwardly through the outer rod, for the purpose described, said air vent serving as an opening for introduction of lubricant into the interior of the rod.

3. In a double plunger pump, the combination of an outer hollow pump rod, a cross head therefor, an inner pump rod passing through said cross head, and through the outer rod, a gland for orotecting the point of introduction of the inner rod, a passage- Way for lubricant formed in the cross head and communicating with the interior of the outer rod, and means forming an oil chamber in the cross head having communication with the passageway above the level of the base of the chamber.

4. In a double plunger pump, the combination of an outer hollow pump rod, a cross head therefor, an inner pump rod passing through said cross head, and through the outer rod, a gland for protecting the point of introduction of the inner rod, a passageway for lubricant formed in the cross head and communicating with the interior of the outer rod, and means forming an oil chamber in the cross head having communication with the passageway above the level of the base of the chamber, said chamber having an air vent above the level of the passageway.

GEORGE E. l VILLERS. 

